Optical pump-terahertz probe of smooth ultrathin gold films
Maksim I. Paukov1, Dmitry I. Yakubovsky1,2, Shuang Sun3,4, Aleksandr S. Marakulin1, Gennady A. Komandin5, Andrey A. Vyshnevyy1,2, Kirill I. Zaitsev5, Aleksey V. Arsenin2
Yan Zhang3,4, Maria G. Burdanova1,5,6; 1Center for Photonics and 2D Materials, MIPT, Phystech, Dolgoprudny, Russia; 2Emerging Technologies Research Center, XPANCEO, Dubai, United Arab Emirates; 3Beijing Key Laboratory for Metamaterials and Devices, Key Laboratory of Terahertz Optoelectronics, Ministry of Education of China, Beijing, China;
4Beijing Advanced Innovation Center for Imaging Technology, Department of Physics, Capital Normal University, Beijing, China; 5Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia; 6Osipyan Institute of Solid State Physics of the Russian Academy of Sciences, Chernogolovka, Russia
Abstract
Material science has succeeded in the fabrication of ultrathin films, including metallic ones. These films present considerable interest for studying at terahertz frequencies due to their low-dimesionality and free charge conductivity. The current research uncovers the possibility of the light manupulation of the response of smooth ultrathin (<10 nm) gold films at terahertz (THz) frequencies. Three wavelengths (400, 600, 800 nm) were chosen to pump the sample, according to its specific absoption features.The sample thicknesses were 2, 3, 5, and 8 nm, as verified by Atomic Force Microscopy (AFM). During the investigation of these samples, the tunable parameter was the pump beam fluence as well. The observed variation of the THz response reaches 12% at 600 nm pump (fluence 7.3 mkJ/cm2) of the film with the thickness 3 nm. Combined with the unique mechanical and thermal properties of such films, this study which paves a path towards to practical applications in terahertz systems.
Speaker
Paukov Maksim
Center for Photnics and 2D Materials, MIPT, Phystech
Russia
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